What Do You Know About Gasoline Fuel Systems? Trivia Quiz

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1. For a gasoline engine, the optimum air to fuel ratio by mass is about:

Explanation

14.7:1 is the ratio needed for ideal combustion.

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About This Quiz
What Do You Know About Gasoline Fuel Systems? Trivia Quiz - Quiz


What do you know regarding gasoline fuel systems, and do you think you know enough to pass this quiz? The fuel system is critical in storing and delivering... see morethe gasoline or diesel fuel, which helps the engine to run. If there is one component out of place, it could throw off the whole fuel system. Take this quiz to learn more about gasoline fuel systems. see less

2. For gasoline to burn properly, it must be mixed with the right amount of:

Explanation

Remember chemistry. What are required for the reaction of combustion?

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3. The most important job of the fuel system is to optimize engine performance while:

Explanation

Fuel consumption and emissions regulation are the two most important factors in today's automotive engineering.

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4. Which of these fuel characteristics helps to prevent the air–fuel mixture from spontaneously igniting in the combustion chamber?

Explanation

Octane is the volatility rating of fuel.

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5. Which of these is a sensor for measuring crankshaft position?

Explanation

The CKP is responsible for monitoring the position of the crankshaft with respect to degrees of rotation.

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6. The purpose of the vehicle speed sensor (VSS) is to measure the:

Explanation

VSS is an acronym for vehicle speed sensor.

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7. The barometric pressure (BARO) sensor works in conjunction with the:

Explanation

The barometric pressure sensor is an input that tells the engine control computer the ambient pressure of atmospheric air. The MAP does the same, but reports the engine intake manifold pressure.

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8. A variation in pulse width at a fixed frequency is called:

Explanation

The control for the duty cycle is called a pulse width modulation.

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9. A resistor that changes its resistance with changes of temperature is called a:

Explanation

What is used to check your body temperature? Now think of that electrically.

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10. The power train control module (PCM) must control a high-current fuel pump. The best actuator to use would be a:

Explanation

Relays act as a bridge between a circuit requiring a high current and a circuit needing low current. Keep in mind, high and low are relative terms.

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11. Tech A says that an electronic control unit (ECU)/power train control module (PCM) is needed to make electronic fuel injection (EFI) function correctly. Tech B says that most early EFI systems were throttle body injection (TBI) type systems. Who is correct?

Explanation

A computer is required to control the timing of injectors and how long they will be open. The earliest forms of fuel injection were through one injector into the throttle body.

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12. The engine misfire monitor directly detects a fault by monitoring:

Explanation

If a cylinder isn't firing, the crankshaft speed will slow down for the effected cylinder.

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13. Tech A says that most fuel-injected vehicles use one or two electrical pumps to supply the fuel system with pressurized fuel. Tech B says that with today's systems, a fuel pump is likely to be located inside the fuel tank. Who is correct?

Explanation

Electrical pumps are the standard when it comes to cars with electronic fuel injection. These pumps are in the tank, submersed in fuel for most of their existence.

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14. Tech A says that engine misfiring will cause a lean exhaust condition. Tech B says that engine misfiring can cause overheating of the catalytic converter. Who is correct?

Explanation

When an cylinder misfires, the fuel remains unburned. The catalyst speeds the reaction of converting unwanted combustion by-products into safer emissions. This process is exothermic and is exaggerated when there is an excess of hydrocarbons in the exhaust.

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15. Modern fuel filters typically have all of these characteristics EXCEPT:

Explanation

They do not quite the system. Pumps most often have a whine, but the filter does nothing to lessen it.

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16. The on and off time of a stepper motor relates to its duty cycle, which is generally expressed as a:

Explanation

The amount of time something is on or off, the duty cycle, is expressed as a percentage.

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17. Tech A says that a slightly lean mixture offers good fuel economy and low exhaust emissions. Tech B says that a mixture that is too rich fouls spark plugs and causes incomplete burning. Who is correct?

Explanation

Both Techs A and B are correct. A slightly lean mixture, which means there is a higher proportion of air to fuel, can offer good fuel economy and low exhaust emissions. On the other hand, a mixture that is too rich, with a higher proportion of fuel to air, can lead to fouled spark plugs and incomplete burning. Therefore, both Tech A and Tech B provide accurate explanations about the effects of lean and rich mixtures.

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18. Which of these describes when the air–fuel mixture spontaneously ignites before the spark plug fires?

Explanation

What prefix is needed to define something that occurs before the desired time?

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19. A fuel pump can be tested using a lab scope and a low-amp clamp to:

Explanation

Monitoring current draw of a fuel pump is very helpful in diagnosing no start conditions.

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20. All of these are advantages of electronically controlled fuel injection over mechanical injection systems EXCEPT:

Explanation

Continuous tweeking of air-fuel ratios, reducing emissions, and reducing fuel consumption are products of advancements in automotive engineering.

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21. All of these are subsystems of modern fuel injection systems EXCEPT:

Explanation

Emissions is a product of the other 3 systems. It is not controlled by a control module / computer.

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22. The term "stoichiometric ratio" describes the chemically correct air–fuel ratio necessary to achieve all of these EXCEPT:

Explanation

The other three are disregarded when all we want is the upper level of engine power. The stoichiometric ratio will result in a higher level of the others listed.

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23. Tech A says that fuel pump pressure can often be tested by accessing a test port. Tech B says that fuel pump volume can be affected by the condition of the fuel injectors. Who is correct?

Explanation

If there is a test port to test supply pressure, that's the way to go.
The fuel pump determines the amount of fuel delivered. The injectors only open and close.

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24. Which of these has the function of monitoring the noise that is created by a pressure spike in the combustion chamber?

Explanation

When there is pre-ignition or detonation, there is a physical disturbance in the engine block/ The knock sensor is an input that tells the engine control computer that there is an undesirable explosion in the combustion chamber.

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25. Early mechanically operated fuel systems typically sprayed:

Explanation

The first fuel injectors were not as sophisticated as today's designs. Later technology allows us to time when the injectors open, and for what length of time.

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For a gasoline engine, the optimum air to fuel ratio by mass is about:
For gasoline to burn properly, it must be mixed with the right amount...
The most important job of the fuel system is to optimize engine...
Which of these fuel characteristics helps to prevent the...
Which of these is a sensor for measuring crankshaft position?
The purpose of the vehicle speed sensor (VSS) is to measure the:
The barometric pressure (BARO) sensor works in conjunction with the:
A variation in pulse width at a fixed frequency is called:
A resistor that changes its resistance with changes of temperature is...
The power train control module (PCM) must control a high-current fuel...
Tech A says that an electronic control unit (ECU)/power train control...
The engine misfire monitor directly detects a fault by monitoring:
Tech A says that most fuel-injected vehicles use one or two electrical...
Tech A says that engine misfiring will cause a lean exhaust condition....
Modern fuel filters typically have all of these characteristics...
The on and off time of a stepper motor relates to its duty cycle,...
Tech A says that a slightly lean mixture offers good fuel economy and...
Which of these describes when the air–fuel mixture spontaneously...
A fuel pump can be tested using a lab scope and a low-amp clamp to:
All of these are advantages of electronically controlled fuel...
All of these are subsystems of modern fuel injection systems EXCEPT:
The term "stoichiometric ratio" describes the chemically correct...
Tech A says that fuel pump pressure can often be tested by accessing a...
Which of these has the function of monitoring the noise that is...
Early mechanically operated fuel systems typically sprayed:
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